Blowpipe



Jan. 5 ,1926.

J. HARRIS BLOWPIPE Filed Jan. 27, 1923 2 Sheets-Sheet 1 J. HARRIS Jan. 5 1926.

BLOWPIPE Filed Jan. 27.. 1925 2 Sheets-Sheet 2 Patented Jan. 5, 1926.

UNITED STATES JOHN HARRIS, OF CLEVELAND, OHIO.

IBLOWPIPE.

Application filed January 27,1923; Serial No. 615,190.

To .2 whom 2'25 may] concern:

Be it known that I, JOHN HARRIS, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Blowpipes, of which the followin" is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to blowpipes, and

has for its general object to provide 1mproved parts and connections whereby the supplying of gases to the b'lowpipe head through and in connection with the handle and the valve-block may be improved.

7 Further and more limited objects of the invention are to provide an improved connection between the individual pipes and the front portion of the handle casingyto provide improved means for controlling the supply of the cutting oxygen to the blowpipe; and to improve the construction and' operation of the valve which controls such oxygen supply.

Still further and more limited objects of the invention will appear hereinafter and will be set forth in the claims appended hereto.

In the drawin s forming part hereof, Fig. 1 represents a side elevation of a blowpi pe and its handle portion, embodying my invention;

Fig. 2, a plan view of the rear portion of the blowpipe assembly shown in Fig. 1;

Fig. 3, :1. detail in sectional elevation through the handle portion of the blow- 1 e; p Figs. 1 and 5, sectional details .taken repectively on the lines of Fig. 1 and 5-5 of Fig. 4:; w

Fig. 6, a like detail taken on the line 6-6 of Fig. 4; v Fig. 7 a sectional detail taken on the line 7-7 of Fig. 3;

Fig. 8, a sectional detail taken on the line 88ofFig.1;-

Fig. 9, a sectional detail taken on the line 99 of Fig. 4; and

Fig. 10, a sectional detail taken on the.

line 1010 of Fig. 9. j

\ Describing the various parts by reference characters, 1 denotes generally a blowpipe head, the same being of any construction;

adapted to cut metal with oxygen in the usual manner and adapted to have connected thereto the tubes 2, 3 and 4, which conduct to such head cutting oxygen, preheating oxygen, and a combustible gas, respectively.

These tubes extend rearwardly from the blowpipe head and are connected at their rear ends to a valve block, which block will now be described. This valve block comprises an intermediate cylindrical portion 5 and a forwardly projecting portion 6 of smaller sectional area than the portion 5. The portion 5 receives the cylindrical rear end of a handle casing 7, which casing is fastened thereto in any suitable manner, as'by means of screws 8. The rear end of the valve block projects beyond the handle casing 7, as indicated at 9, there being an annular shoulder 9 between the parts 5 and 9 against which the rear end of the handle casing may abut.

Integral with the rear end of the valve block are connections 10 and 11, the former connection being adapted to receive oxygen and the latter connection any suitable combustible gas, the gases being supplied thereto from tanks or containers in the usual manner through flexible tubing (not shown) applied to the detachable connection-extensions 10 and 11 Combustible gas supplied through the connection 11 enters the valve block through the L-shaped passageway 12, the vertical branch of said passageway being adapted to discharge into the valve chamber 13, from which a passageway 14 leads to a connecting socket 15 in the portion 6 of the valve block, said socket having the pipe 4. connected thereto; a needle valve 16 mounted in the rear portion 9 of the valve block controls the flow of combustible gas from the passage 12 through the passage 14 to the pipe 4.

Oxygen for cutting purposes and for ad mixture with the combustible gas is supplied to the connection 10 and thence, by passageways 17 and 18, to the valve chambers 19 and 20, respectively. The first-mentioned valve chamber has therein a needle valve 21 adapted to control the upper part of the passageway 17, and from said chamber a passageway 22 leads to the socket connection 23 in the portion 6 of the valve block, which socket connection receives the rear end of the pipe 3.

The valve chamber 20 extends longitudinally of the valve block and has its rear end provided with a thread 20 in which is threaded the removable cap 21. The forward end of the chamber isprovided with a central annular valve seat fl'OiTl which a passageway 26 extends forwardly, said passageway being connected by a vertical passageway 27 with a passageway 28 in the front end of the block and communicating with the socket 29 in which the rear end of the pipe 2 is mounted. The pipes 2 and 3- are crossed within the handle, as shown in Fig. 3, so that the pipe 2 will be uppermost and pipe 3 the middle pipe of the series connecting with the blowpipe headt'he particular type of blowpipe illustrated herein being adapted forthe supply of cutting oxygen to the top of the head thereof and for the supply of'prehea-ted oxygen to a suitable passageway located below the one for cutting-oxygen.

The forwardly extent-ling central portion of the valve block has reciprocably mounted therein a valve operating stem, the rear end of said stem operating the valve that controls the how of cutting oxygen through the pipe 2; This valve comprises a body 30, n'eferably of brass, the body having an intermediate reduced cylindrical portion and hexagonal, or other polygonal end portions 30, adapted to engage the cylindrical inner wall of the chamber 20'and to provide for the free flow of oxygen through the segmental passages 31 provided around such cylindrical and angular portions (seeFigs. l and 9). The front end of the valve 30 is provided with a forwardly projecting annular flange 32 andwith a central stud 33. hIounted within the flange and surrounding the stem is an annular ruber seat which is clamped in place by spinning the upper portion of the flange 32inwardly.

The ruber seat 34: is adapted to contact with the rearwardly projecting annular valve seat 25,, and the central stud 33 is adapted to be engaged by the rear end 35 of the valve-operating stem 35. The rear portion of this stem is reduced, the front.

portion of said stem being enlarged and fitting within a guideway 36 provided in front of the passage or chamber 26 and extending through a plug 8T which is threaded into an enlarged recess in the front end of the valvehlock portion 6.

in order to provide an ethcient packing for the stem 35 which will prevent the escape of oxygen therearound, rubber diaphragins 38 are clampedhetween the rear of the plug 6 and the seat formegl for the Fear end of such plug in the front ofthe part (i, said diaphragms fitting closely about the stem and, as the latter is moved, rearwardly to open the Valve 30, being bulged rearwardly by such movement into the rear part 39 of the plug chamber, such bulging insuring a close gripping contact between the edges of the bores of said diaphragnis and the stem. Furthermore, the pressure of the ox gen against the diaphragius lend to close t eir inner walls against the stem.

A spring 40 bears at one end against the rear end of the valve 30 and at its opposite end against the cap 24, within a cup formed therewithin, and normally holds the said valve against the seat 25. For the purpose of operating the valve 30 to permit oxygen to flow through the pipe 2, I provide an angle lever and mount the same upon the casing 7'. The casing is provided with a slot 7 in the top thereof and a pivotal support for the angle lever is formed by means of a sheet metal housing 41 secured to the casing 7 by means of a base flange ll riveted to such casing. The upwardl} projecting portion of the housing provides a support by its opposed parallel walls 411" for a pivot 4-2 on wl-iich the angle of the opera-ting lever is mounted. The lever comprises a relatively long operating arm 4-2-3 projecting forwardly from the housing all and a short valve-operating arm 43? projecting through the slot 7* and in operative relation to the forward end of the stem 35. At the front end, the casing is drawn by dies into a shape to provide a resilient clamping portion 7 the said'end portion being so shaped as to form resilient clamping seats for the reception of the pipes 2, 3 and a. The top and bottom seats are indicated at 7 and are so shaped as to engage the major portions of the parts of the pipes 2 and at which extend respectively therethrough. The intermediate'seats'i are also shaped so as to engage considerable portions of the opposite sides of the part of the pipe 3 which passes therethrough', the opposite walls of the parts 7 being pressed inwardly between the pipe-receiving and engaging portions thereof, as clearly indicated in Fig; 8; lhepipe-engaging part of the casing 7 is given the particularshape shown and de scribed prior to the insertion of the pipes 2, 3 and -.'l therethrough and into the valve block sockets; and the parts are so shaped that the pipes are grippedtigllt'ly bythe cooperating parts 7?.

By the construction shown and described herein, the flow of preheating gases and cutting oxygen to. the blow-pipe is readily controlled and the supply of cutting oxygen is conveniently effected by use of the hand which grasps the handle 7. The'manner of mounting the oxygen valve and the arrangement of'the parts for operating the same enables this valve to function most effectively without any leakage of oxygen and without any unsightly projections on the handle casing. When the valve 30 be comes worn, it is very easily removed and a new valve inserted, and the cost of such valve is relatively small. The diaphragms 38' provide a most effective and long-lasting stuthng box for the operating stem In practice, the pipe engaging portion 7" of the handle casing is shaped by means of suitable dies into the three clamps that are shown, which clamps engage their respective pipes so firmly that the latter have to be driven through such clamps and into their sockets in the valve block. The clamps thus serve to space the pipes apart and prevent any rattling between the handle casing and the pipes. This freedom from rattling is due to the tight clamping and the resilience of the metal of which such clamping portion is composed.

Having thus described my invention, what I claim is:

1. In a blow pipe, the combination of a head, a valve block, tubes for conducting oxygen and a combustible gas from said valve block to said head, a handle casing mounted on the valveblock and extending toward the blow pipe head and having its forward end formed into clamps engaging said tubes, one or more valves in said block, and valveoperating means carried by said casing.

2. In a blow pipe, the combination of a head, tubes for conducting oxygen and a combustible gas to said head, a handle casing surrounding said tubes and having an end formed into clamps yieldingly engaging the said tubes, a valve for cutting oxygen, and means for operating said valve.

3. In a blow pipe, the combination of a head, a valve block, tubes connecting the said head and valve block for conducting cutting and preheating oxygen and a combustible gas from the block to the head, and a handle casing mounted upon and projecting forwardly from the valve block, the front end of said casing being formed into a pair of opposed resilient walls each having seats formed therein for said tubes and yieldingly engaging ghe latter.

4. In a blow pipe, the combination of a head, a valve block having connections for supplying cutting and preheating oxygen and a combustible gas to said head, tubes connecting the said head and the said valve block, and a handle casing secured to and projecting forwardly from said block and having its front end formed into resilient clamping means engaging and supporting the said tubes.

In testimony whereof, I hereunto aflix my signature.

JOHN HARRIS. 

